Journal Archive

2022

/**
 * @param {number} x
 * @return {boolean}
 */
var isPalindrome = function(x) {
    if (x < 0) return false;
    let copyX = x;
    let y = 0;
    let loop = 0;
    
    while (copyX > 0) {
        y = 10 * y + (copyX % 10);
        copyX = Math.floor(copyX / 10);
    }
    
    return y === x;
};

Day 80: Solving one of LeetCode problems

9. Palindrome Number Difficulty - Easy

Given an integer x, return true if x is palindrome integer.

An integer is a palindrome when it reads the same backward as forward.

  • For example, 121 is a palindrome while 123 is not.

 

Example 1:

Input: x = 121
Output: true
Explanation: 121 reads as 121 from left to right and from right to left.

Example 2:

Input: x = -121
Output: false
Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.

Example 3:

Input: x = 10
Output: false
Explanation: Reads 01 from right to left. Therefore it is not a palindrome.